solidity/test/formal/opcodes.py
2021-10-13 16:20:10 +02:00

82 lines
1.4 KiB
Python

from z3 import BitVecVal, BV2Int, If, LShR, UDiv, ULT, UGT, URem
def ADD(x, y):
return x + y
def MUL(x, y):
return x * y
def SUB(x, y):
return x - y
def DIV(x, y):
return If(y == 0, 0, UDiv(x, y))
def SDIV(x, y):
return If(y == 0, 0, x / y)
def MOD(x, y):
return If(y == 0, 0, URem(x, y))
def SMOD(x, y):
return If(y == 0, 0, x % y)
def LT(x, y):
return If(ULT(x, y), BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def GT(x, y):
return If(UGT(x, y), BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def SLT(x, y):
return If(x < y, BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def SGT(x, y):
return If(x > y, BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def EQ(x, y):
return If(x == y, BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def ISZERO(x):
return If(x == 0, BitVecVal(1, x.size()), BitVecVal(0, x.size()))
def AND(x, y):
return x & y
def OR(x, y):
return x | y
def NOT(x):
return ~(x)
def SHL(x, y):
return y << x
def SHR(x, y):
return LShR(y, x)
def SAR(x, y):
return y >> x
def BYTE(i, x):
bit = (i + 1) * 8
return If(
UGT(i, x.size() / 8 - 1),
BitVecVal(0, x.size()),
(LShR(x, (x.size() - bit))) & 0xff
)
def SIGNEXTEND(i, x):
bitBV = i * 8 + 7
bitInt = BV2Int(i) * 8 + 7
test = BitVecVal(1, x.size()) << bitBV
mask = test - 1
return If(
bitInt >= x.size(),
x,
If(
(x & test) == 0,
x & mask,
x | ~mask
)
)